Discussion
Which technology reduces that penalty?
Answer: A
A heat pump delivers several times as much heat as the electrical energy it consumes. The last option explains exactly that principle, which makes it a correct and more instructive version of the same answer. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming what changes and what stays the same is the reliable route through questions of this shape.
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